IGNEOUS TEXTURES Flashcards by claire jansen

Q

3 factors affecting crystal size and texture

A

rate of cooling
amount of silica
amount of volatiles

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Q

glassy

A

RAPID COOLING

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Q

APHANITIC

A

fine-grained
RAPID COOLING
contain bubbles

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Q

PHANERITIC

A

coarse-grained
SLOW COOLING
large crystals

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Q

PEGMETITIC

A

VERY coarse-grained
SLOW COOLING
LARGE crystals

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Q

PORPHYRITIC

A

LARGE AND SMALL CRYSTALS (different cooling rate)

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Q

pyroclastic

A

violent volano eruption
FUSED ASH
WELDED TUFF

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